Final answer:
A contraindication for the use of red cell salvage in medical procedures is when red blood cells are destroyed by complement and antibody during a transfusion of mismatched blood type or during hemolytic disease of the newborn.
Step-by-step explanation:
A contraindication for the use of red cell salvage in medical procedures is when red blood cells are destroyed by complement and antibody during a transfusion of mismatched blood type or during hemolytic disease of the newborn. This occurs when there is a mismatch between the blood types of the donor and recipient, leading to a potentially lethal immune response called hemolytic transfusion reaction. The activation of the complement cascade and the binding of antibodies to the transfused red blood cells result in their destruction, causing various symptoms and complications.